Acoustic horn



FIG. 1 is a side elevational view of an acoustic horn, showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is an end elevational view thereof;

FIG. 4 is an elevational view of the opposite end thereof;

FIG. 5 is a bottom plan view thereof. 

The ornamental design for an acoustic horn, substantially as shown and described. 